Have you tried re? Try this: It'll show you where you went wrong.

#!/usr/local/bin/perl 

use strict;
use warnings;
use re qw(debug);

open IN, '<', '/root/Desktop/new file';
while(<IN>) {
    if($_ =~ /\$display(.*?);$/i) {
        print $_;
    }
}
close IN;
[download]

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